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Both headlights went out. I've replaced the headlamps fuse and one headlight with no luck. Someone suggested perhaps I need to replace headlamp relay but I can't locate it.

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  • Cars & Trucks Master
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Just trace the wires from the headlamps to the firewall where the relays are usually situated. Replace the burnt out relay by unplugging it and mounting it on the firewall.

Posted on Jul 10, 2010

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98 cad deville headlights stay on headlight & twilight sentinel switch is off along with the ign. i'm stumped can you help. Ted


Did you check the high/ low beam headlamp relay ? Stuck contacts in side relay .Plus headlamp relay an DRL relay .All are located in the underhood relay center .
The headlamps are controlled by the body control module (PZM). The battery positive voltage (B+) is applied at all times through the HDLPS fuse at the switch side of the headlamp relay via CKT 340 (ORN).
Battery positive voltage (B+) is also applied at all times through the RADIO/PHONE fuse to the coil side of the high/low beam headlight relay via CKT 40 (ORN/BLK). Both relays are controlled by the PZM at separate output cavities.

When the headlamp switch is in the HEAD position, the instrument cluster headlamp switch input is grounded through CKT 10 (YEL) and the headlamp switch. The instrument cluster sends a request through the Class 2 serial data line to the BCM in order to active the low beam headlamps. The BCM supplies positive battery voltage (B +) to the coil side of the headlamp relay via CKT 352 (WHT). The coil receives ground through the headlamp switch via CKT 10 (YEL). The coil of the headlamp relay is then energized, closing the switch contacts. Battery positive voltage (B +) is then applied through the high/low beam headlamp relay via CKT 1346 (LT BLU) and the L HDLP LO fuse and R HDLP LO fuse via CKT 12 (TAN) to the left and the right low beam headlamps respectively.
This may sound pretty complex .
1
Was the Headlights System Check performed?
--
YES - Go to Step 2
NO - Go to Headlight System Check
2
Are the park lamps also on?
--
YES - Go to Step 3
NO - Go to Step 13
3
Connect a Scan Tool to the data link connector (DLC).
Inspect the IPC headlamp switch input.
Does the headlamp switch operate properly?
--
YES - Go to Step 4
NO - Go to Step 10
4
Disconnect the instrument cluster (IPC) connector C3.
Do the headlamps and park lamps turn off?
--
YES - Go to Step 5
NO - Go to Step 6
5
Replace the instrument cluster (IPC). Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.
Is the repair complete?
--
Go to Headlight System Check
Is the repair complete?

6
Disconnect the body control module (PZM) connector C2.
Do the headlamps and park lamps turn off?
--
Go to Step 7
Go to Step 8
7
Replace the body control module (PZM). Refer to Body Control Module Replacement in Body Control System.
Is the repair complete?
--
Go to Headlight System Check
--

Your best bet is to take it to the dealer .

Mar 18, 2016 | Cars & Trucks

2 Answers

My low beam headlights will not come on! My daylight running lights work during the day and I have high beams but at night I have nothing but high beams ???


Battery positive voltage (B+) is supplied through the LH underhood fuse block LCM/HDLP circuit breaker via CKT 242 (RED) at all times to the following components:
?€¢
Headlamp switch


?€¢
Lamp control module (LCM)


?€¢
Switch of the RH IP fuse block headlamp relay position J

When the headlamp switch is placed in the ON position, battery positive voltage (B+) is supplied via CKT 10 (YEL) to the coil of the headlamp relay position J. The coil is permanently grounded to G201 via CKT 1450 (BLK). The coil is energized and the contacts close providing battery positive voltage (B+) to the headlamp dimmer switch via CKT 1346 (LT BLU). When the headlamp dimmer switch is in the LOW position, battery positive voltage (B+) is supplied via CKT 12 (TAN) to the following components:
?€¢
Left low beam headlamp


?€¢
Right low beam headlamp The LCM provides battery positive voltage (B+) via CKT 1346 (LT BLU) through the headlamp dimmer switch to the headlamps under the following conditions:
?€¢
The ignition switch is in the RUN position.


?€¢
The ambient light sensor indicates darkness.

The lamp control module (LCM) monitors the ambient light conditions through the ambient light sensor. The ambient light sensor is a variable resistor whose resistance changes as the surrounding ambient light level changes. As the ambient light decreases, the resistance of the ambient light sensor increases. The LCM measures the resistance across the ambient light sensor and determines whether it is day or night.
Headlamps Inoperative - Low Beams (Oldsmobile)
This is a lengthy diagnostic flow chart .

1

Did you perform the headlights system check?
--
Go to Step 2
Go to Headlight System Check

2

  1. Disconnect the lamp control module (LCM) connector C1.
  2. Connect a DMM from the LCM connector C1 cavity E (RED) to ground.
Is the voltage within the specified range?
10-15V
Go to Step 3 yes
Go to Step 9 no

3

Use a test lamp in order to backprobe the headlamp switch connector from cavity D (RED) to ground.
Does the test lamp light?
--
Go to Step 4
Go to Step 10

4

  1. Remove the headlamp relay position J from the RH IP fuse block.
  2. Connect a DMM from the headlamp relay position J cavity 30 (RED) to ground.
Is the voltage within the specified range?
10-15V
Go to Step 5
Go to Step 11

5

  1. Place the headlamp switch in the HEAD position.
  2. Connect a DMM from the headlamp relay position J cavity 85 (YEL) to ground.
Is the voltage within the specified range?
10-15V
Go to Step 6 yes
Go to Step 12 no

6

Connect a DMM from the headlamp relay position J cavity 30 (RED) to cavity 86 (BLK).
Is the voltage within the specified range?
10-15V
Go to Step 7 yes
Go to Step 14 no

7

Connect a fused jumper from the headlamp relay position J cavity 30 (RED) to cavity 87 (LT BLU).
Do the low beam headlamps light?
--
Go to Step 15 yes
Go to Step 8 no

8

  1. Leave the fused jumper in place.
  2. Use a test lamp in order to backprobe the headlamp dimmer switch connector C202 from cavity C5 (LT BLU) to ground.
Does the test lamp light?
--
Go to Step 17 yes
Go to Step 16 no
Repair the open in CKT 242 (RED) between S201 and the LCM. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
--
Go to Headlight System Check
--

10

Repair the open in CKT 242 (RED) between S201 and the headlamp switch. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
--
Go to Headlight System Check
--

11

Repair the open in CKT 242 (RED) between S201 and the RH IP fuse block. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
--
Go to Headlight System Check
--

12

Inspect for an open in CKT 10 (YEL) between the headlamp switch and the RH IP fuse block. Refer to Testing for Continuity in Wiring Systems.
Is CKT 10 OK?
--
Go to Step 13
Go to Step 19

13

Replace the headlamp switch. Refer to Instrument Cluster Trim Panel Replacement in Instrument Panel, Gauges and Console.
Is the repair complete?
--
Go to Headlight System Check
--

14

Repair the open in CKT 1450 (BLK) between the RH IP fuse block and S308. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
--
Go to Headlight System Check
--

15

Replace the headlamp relay position J in the RH IP fuse block.
Is the repair complete?
--
Go to Headlight System Check
--

16

Repair the open in CKT 1346 (LT BLU) between the RH IP fuse block and the headlamp dimmer switch connector C202. Refer to

17

Inspect for an open in the CKT 12 (TAN) wiring between the headlamp dimmer switch connector C202 and S257. Refer to Testing for Continuity in Wiring Systems.
Is CKT 12 OK?
--
Go to Step 18
Go to Step 19

18

Replace the headlamp dimmer switch. Refer to Dimmer Switch Assembly - Disassemble - Off Vehicle and Dimmer Switch Assembly - Assemble - Off Vehicle in Steering and Column-Tilt.
Is the repair complete?
--
Go to Headlight System Check
--

19

Repair the suspect wiring. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
--
Go to Headlight System Check



Sep 06, 2015 | 1998 Oldsmobile 88

2 Answers

All of my running lights and blinkers work and high beams but no low beams on my 1997 Chevrolet TahoeA


Headlamps Inoperative - Low Beams

Step

Action

Value(s)

Yes

No

DEFINITION: This diagnostic procedure should only be used if the high beam headlamps are operating properly and the low beams are inoperative.

1

Did you perform the Headlights System Check?
--
Go to Step 2
Go to Headlight System Check

2

  1. Turn the headlamp and panel dimmer switch to the ON position.
  2. Move the headlamp dimmer switch to the LOW position.
  3. Backprobe the headlamp dimmer switch connector with a J 35616-200 from cavity A to ground.

Does the test lamp light?
--
Go to Step 3
Go to Step 5

3

  1. Remove the daytime running lamp relay.
  2. Connect a J 35616-200 at cavity G5 to ground.

Does the test lamp light?
--
Go to Step 4
Go to Step 6

4

  1. Re-install the daytime running lamp relay.
  2. Backprobe cavity B at the high/low beam headlamp with the headlamp dimmer switch in the LOW position.

Does the test lamp light?
--
Go to Step 7
Go to Step 8

5

Replace the headlamp dimmer switch.

Is the repair complete?
--
Go to Headlight System Check
--

6

Repair the open in CKT 359 (PPL) between the headlamp dimmer switch and the daytime running lamp relay.

Is the repair complete?
--
Go to Headlight System Check
--

7

Replace the high/low beam headlamps.

Is the repair complete?
--
Go to Headlight System Check
--

8

  1. Inspect for an open in CKT 12 (TAN) between the daytime running lamp relay and S120, repair as necessary.
  2. Replace the daytime running lamp relay if no open was found in CKT 12 (TAN) between the daytime running lamp relay and S120.

Is the repair complete?
--
Go to Headlight System Check
--

Jul 24, 2015 | Chevrolet Cars & Trucks

1 Answer

Can someone please tell me where to locate the headlight fuse relay in a 2004 Hyundai Santa fe? My headlights went out and the fuses are both good but I cannot find the relay to replace it.


Things to check; common wire for ground may be disconnected so take the common wire and run a jumper to the battery.
lights could be bad they wear out too. Substitute
a known good lamp in both sides to see if this fixes problem.
Headlights also go thru the dimmer switch so run headlights to battery with a jumper wire. This bypasses headlamp switch and dimmer.
Consult the owners manual for fuses,relays and their locations. One fuse box is usually inside passenger compartment and another under the hood.
Hope this helps.

Mar 23, 2015 | 2004 Hyundai Santa Fe

1 Answer

Turned headlamps on this evening Then went turn off back lights go out but headlamps stay on ??? So had too undo battery


The headlights do have a relay for them, it is located in the fuse box under the hood. Tjere should be a diagram telling you which relay works the headlights under the fuse box cover.

Oct 23, 2013 | Cars & Trucks

1 Answer

My headlights both went out while driving at the same time. Is this a headlight fuse issue?


REPLACE THE HEADLAMP DIMMER SWITCH IF THE HIGH BEAMS WORKS ONLY. IF ALL NOT WORKING YOU HAVE A FAULTY HEADLAMP SWITCH THE FILAMENTS IN THE HEADLIGHTS ARE THE FUSE. THEY BURN OUT WHEN THE TUNGSTEN ELEMENT GIVES OUT

Aug 20, 2011 | 2005 Toyota Matrix

1 Answer

05 altima 3.5 r/f headlight does not work replaced


There should be a main fuse box under the hood. The headlights have a main fuse for each side. There should be one for the left and right headlamp. Check the fuse for the r/f headlamp. If it is blown, then that is the cause for the headlamp not to work. Replace with a new fuse and it should be good to go. If not, check the bulb itself.

Feb 17, 2010 | 2002 Nissan Sentra

1 Answer

Driver's headlight is dim; wipers only work if headlight is off


Sounds like the jolt from the barrier has caused a bad ground to occur. Look for a bad ground wire around the left headlamp in or around the headlight bucket.
Tighten or replace the bad ground wire. A poor contact will cause the headlight to light dimly.

Mar 03, 2009 | 2008 Ford Focus SE Sedan

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